Hello Jasmina and welcome to the Community!
Thanks for reaching out about Bitbucket authentication plugins. The best method to find available and supported apps for any Atlassian product would be the marketplace. The marketplace may be found at Marketplace.atlassian.com.
Additionally, you may find a preset search for OAuth apps at the following; Atlassian Marketplace | OAuth for Server.
If you’re looking for SSO or SAML based authentication then you may find those apps at Atlassian Marketplace | SAMO/SSO for Server.
I hope this information proves helpful and you’re able to find what you need.
Regards,
Stephen Sifers
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